Disclosed is a polymer electrolyte membrane for a fuel cell, which restrains
a crossover phenomenon of fuel and a decomposition of a polymer membrane over platinum,
and shows outstanding power output and performance characteristics during operation
of the fuel cell, and a method for producing the same. The method comprises the
steps of blending a polymer matrix with a fluorinated ionomer of 3 to 50 wt % based
on a weight of a polymer to produce a blended polymer solution; casting the blended
polymer solution into a polymer membrane; and coating the fluorinated ionomer on
both sides of the polymer membrane to produce a composite membrane. The polymer
electrolyte membrane has advantages in that the fuel cell using the polymer electrolyte
membrane, which has high energy efficiency, can be inexpensively produced, and
so the fuel cell can be applied in various applications such as a power source
of a nonpolluting car, on-site generation of electricity, an electric power source
of a spacecraft, a portable energy source, and an energy source for military purpose.
